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| 1 | +import { Client } from "@modelcontextprotocol/sdk/client/index.js"; |
| 2 | +import { SSEClientTransport } from "@modelcontextprotocol/sdk/client/sse.js"; |
| 3 | +import EventSource from "eventsource"; |
| 4 | +import { logger } from './logger'; |
| 5 | +import { AntVLibrary } from '../types'; |
| 6 | + |
| 7 | +// --------------------------------------------------------- |
| 8 | +// 1. 全局环境配置 |
| 9 | +// --------------------------------------------------------- |
| 10 | +// Node.js 环境下 MCP SDK 依赖全局 EventSource |
| 11 | +// 作为底层包,为了保证运行时安全,仅在未定义时赋值 |
| 12 | +if (!global.EventSource) { |
| 13 | + // @ts-ignore |
| 14 | + global.EventSource = EventSource; |
| 15 | +} |
| 16 | + |
| 17 | +// --------------------------------------------------------- |
| 18 | +// 2. 单例状态管理 |
| 19 | +// --------------------------------------------------------- |
| 20 | +let _client: Client | null = null; |
| 21 | +let _transport: SSEClientTransport | null = null; |
| 22 | +let _connectingPromise: Promise<Client> | null = null; |
| 23 | + |
| 24 | +/** |
| 25 | + * 获取或初始化 MCP 客户端 (单例模式) |
| 26 | + * 包含防止并发重复连接的锁机制 |
| 27 | + */ |
| 28 | +async function getMcpClient(): Promise<Client> { |
| 29 | + // 如果客户端已存在且传输层看似正常,直接返回 |
| 30 | + // 注意:SSEClientTransport 目前没有直观的 isConnected 属性, |
| 31 | + // 这里的检查主要是防止对象为空。更严谨的做法是监听 transport 的 close 事件来重置 _client。 |
| 32 | + if (_client && _transport) { |
| 33 | + return _client; |
| 34 | + } |
| 35 | + |
| 36 | + // 如果正在连接中,等待同一个 Promise 结果,防止并发请求导致多次 new Client |
| 37 | + if (_connectingPromise) { |
| 38 | + return _connectingPromise; |
| 39 | + } |
| 40 | + |
| 41 | + // 开始初始化连接 |
| 42 | + _connectingPromise = (async () => { |
| 43 | + try { |
| 44 | + logger.info("DeepWiki MCP: 初始化连接..."); |
| 45 | + |
| 46 | + const transport = new SSEClientTransport( |
| 47 | + new URL("https://mcp.deepwiki.com/sse") |
| 48 | + ); |
| 49 | + |
| 50 | + const client = new Client( |
| 51 | + { |
| 52 | + name: "deepwiki-node-client", |
| 53 | + version: "1.0.0", |
| 54 | + }, |
| 55 | + { capabilities: {} } |
| 56 | + ); |
| 57 | + |
| 58 | + // 错误处理:监听传输层关闭或错误,以便下次重连 |
| 59 | + transport.onerror = (err) => { |
| 60 | + logger.error("DeepWiki MCP Transport Error:", err); |
| 61 | + resetClient(); // 出错时重置,下次调用会触发重连 |
| 62 | + }; |
| 63 | + |
| 64 | + transport.onclose = () => { |
| 65 | + logger.info("DeepWiki MCP Connection Closed"); |
| 66 | + resetClient(); |
| 67 | + }; |
| 68 | + |
| 69 | + await client.connect(transport); |
| 70 | + |
| 71 | + // 连接成功,赋值给模块级变量 |
| 72 | + _client = client; |
| 73 | + _transport = transport; |
| 74 | + logger.info("DeepWiki MCP: 连接成功"); |
| 75 | + |
| 76 | + return client; |
| 77 | + } catch (error) { |
| 78 | + logger.error("DeepWiki MCP: 连接失败", error); |
| 79 | + resetClient(); |
| 80 | + throw error; |
| 81 | + } finally { |
| 82 | + _connectingPromise = null; // 释放锁 |
| 83 | + } |
| 84 | + })(); |
| 85 | + |
| 86 | + return _connectingPromise; |
| 87 | +} |
| 88 | + |
| 89 | +/** |
| 90 | + * 重置客户端状态,强制下一次请求重新连接 |
| 91 | + */ |
| 92 | +function resetClient() { |
| 93 | + _client = null; |
| 94 | + _transport = null; |
| 95 | + // 注意:不需要手动 close transport,因为通常是在出错或断开时调用此方法 |
| 96 | +} |
| 97 | + |
| 98 | +// --------------------------------------------------------- |
| 99 | +// 3. 业务导出函数 |
| 100 | +// --------------------------------------------------------- |
| 101 | + |
| 102 | +/** |
| 103 | + * 查询 DeepWiki |
| 104 | + * 外部调用就像调用普通函数一样,无需关心连接管理 |
| 105 | + */ |
| 106 | +export async function queryDeepWiki(_params: {repoName: string, question: string}): Promise<string> { |
| 107 | + try { |
| 108 | + const params = { |
| 109 | + ..._params, |
| 110 | + }; |
| 111 | + if (!params.repoName.includes('/')) { |
| 112 | + params.repoName = getRepoName(params.repoName as AntVLibrary); |
| 113 | + } |
| 114 | + |
| 115 | + // 获取单例客户端 (自动处理连接) |
| 116 | + const client = await getMcpClient(); |
| 117 | + |
| 118 | + // 调用工具 |
| 119 | + const result: any = await client.callTool({ |
| 120 | + name: "ask_question", |
| 121 | + arguments: params, |
| 122 | + }); |
| 123 | + |
| 124 | + // --------------------------------------------------------- |
| 125 | + // 4. 结果处理逻辑 |
| 126 | + // --------------------------------------------------------- |
| 127 | + // result.content 是一个数组,可能包含 text, image 等 |
| 128 | + // 这里我们使用 reduce 提取所有 text 类型的内容并拼接 |
| 129 | + let answer = result.content |
| 130 | + .filter((item: any) => item.type === "text") |
| 131 | + .map((item: any) => item.text) |
| 132 | + .join("\n"); // 如果有多段文本,用换行符拼接 |
| 133 | + |
| 134 | + const regex = /Wiki pages you might want to explore:|View this search on DeepWiki:/i; |
| 135 | + const splitIndex = answer.search(regex); |
| 136 | + // 如果找到了标记 (splitIndex !== -1) |
| 137 | + if (splitIndex !== -1) { |
| 138 | + // 截取从开头到标记之前的部分,并清理末尾的空白 |
| 139 | + answer = answer.slice(0, splitIndex).trimEnd(); |
| 140 | + } |
| 141 | + |
| 142 | + if (!answer || answer.startsWith('Error')) { |
| 143 | + // 防御性编程:如果返回内容为空 |
| 144 | + throw new Error("DeepWiki return Empty/Error Answer, Answer = " + answer); |
| 145 | + } |
| 146 | + |
| 147 | + return answer; |
| 148 | + |
| 149 | + } catch (error) { |
| 150 | + logger.error("DeepWiki Query Error:", error); |
| 151 | + // 根据业务需求,这里可以选择抛出错误,或者返回空字符串/错误提示字符串 |
| 152 | + // 如果是网络断开等错误,resetClient 会在下一次调用时触发重连 |
| 153 | + if (_client) { |
| 154 | + // 如果调用过程中报错,为了保险起见,可以考虑重置连接状态 |
| 155 | + // 视具体错误类型而定,这里简单处理: |
| 156 | + // resetClient(); |
| 157 | + } |
| 158 | + throw error; |
| 159 | + } |
| 160 | +} |
| 161 | + |
| 162 | +export async function adaptedQueryDeepWiki(_params: { repoName: string, question: string }) { |
| 163 | + try { |
| 164 | + const answer = await queryDeepWiki(_params); |
| 165 | + return { documentation: answer } |
| 166 | + } catch (error) { |
| 167 | + return { |
| 168 | + documentation: null, |
| 169 | + error: error instanceof Error ? error.message : String(error), |
| 170 | + } |
| 171 | + } |
| 172 | +} |
| 173 | + |
| 174 | +/** |
| 175 | + * (可选) 显式关闭连接 |
| 176 | + * 供 EggJS 应用在 app.beforeClose 时调用 |
| 177 | + */ |
| 178 | +export async function closeDeepWikiConnection() { |
| 179 | + if (_transport) { |
| 180 | + logger.info("DeepWiki MCP: 关闭连接..."); |
| 181 | + // SDK 目前可能没有直接暴露 close 方法,通常关闭 transport 即可 |
| 182 | + // SSEClientTransport 内部并没有显式的 close 方法暴露出来, |
| 183 | + // 但我们可以将引用置空,让 GC 回收,或者依赖进程退出 |
| 184 | + // 如果 SSEClientTransport 实现了 close,则调用: |
| 185 | + // await _transport.close(); |
| 186 | + |
| 187 | + // 目前 SDK 版本可以直接置空 |
| 188 | + resetClient(); |
| 189 | + } |
| 190 | +} |
| 191 | + |
| 192 | +/** |
| 193 | + * Get the DeepWiki repoName corresponding to the AntV organization. |
| 194 | + */ |
| 195 | +export function getRepoName(library: AntVLibrary): string { |
| 196 | + if (library === 'adc') return 'ant-design/ant-design-charts'; |
| 197 | + return `antvis/${library.toUpperCase()}`; |
| 198 | +} |
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